Results 121 to 130 of about 50,424 (297)

Thaumarchaeal ammonium oxidation and evidence for a nitrogen cycle in a subsurface radioactive thermal spring in the Austrian Central Alps

Frontiers in Microbiology, 2014
Previous studies had suggested the presence of ammonium oxidizing Thaumarchaeota as well as nitrite oxidizing Bacteria in the subsurface spring called Franz Josef Quelle (FJQ), a slightly radioactive thermal mineral spring with a temperature of 43.6 ...
Friedrich Wolfgang Gerbl, Gerhard Wolfgang Weidler, Wolfgang eWanek, Angelika eErhardt, Helga eStan-Lotter   +4 more
doaj   +1 more source

Allosteric communication in Dihydrofolate Reductase: Signaling network and pathways for closed to occluded transition and back [PDF]

arXiv, 2007
E. Coli. dihydrofolate reductase (DHFR) undergoes conformational transitions between the closed (CS) and occluded (OS) states which, respectively, describe whether the active site is closed or occluded by the Met20 loop. A sequence-based approach is used to identify a network of residues that represents the allostery wiring diagram.
arxiv  

Biochemical and structural characterization of chlorite dismutase enzyme from Pseudomonas aeruginosa

The FEBS Journal, EarlyView.
Chlorite dismutase (Cld) is a heme b oxidoreductase that can decompose chlorite (ClO2−$$ {\mathrm{ClO}}_2^{-} $$ or OClO−) into harmless chloride (Cl−) and dioxygen (O2) with high turnover rates. Cld was found to be involved in different biological processes, and the rare reaction it catalyzes makes it a prominent enzyme for different applications. The
Dimitrios V. Nokas, Eleni K. Panagiotopoulou, Antonios I. Kapogiannatos, Georgios E. Premetis, Nikolaos E. Labrou, Eleni K. Efthimiadou, Anastassios C. Papageorgiou, Evangelia G. Chronopoulou   +7 more
wiley   +1 more source

Nitrate ammonification by Nautilia profundicola AmH: experimental evidence consistent with a free hydroxylamine intermediate.

Frontiers in Microbiology, 2013
The process of nitrate reduction via nitrite controls the fate and bioavailability of mineral nitrogen within ecosystems; i.e. whether it is retained as ammonium (ammonification) or lost as nitrous oxide or dinitrogen (denitrification). Here, we present
Thomas E Hanson, Thomas E Hanson, Thomas E Hanson, Barbara J Campbell, Katie M. Kalis, Mark A. Campbell, Martin G Klotz   +6 more
doaj   +1 more source

Surface modified sulfur nanoparticles can escape the glutathione reductase mediated detoxification system in fungi [PDF]

arXiv, 2015
The antifungal effects of orthorhombic (~10 nm; spherical) and monoclinic (~50 nm; tetrapod) sulfur nanoparticles (SNPs) were studied against the NADPH-dependent glutathione reductase (GR) mediated xenobiotic detoxification system (GSH-GSSG) in filamentous fungi (Aspergillus niger as a model organism).
arxiv  

Sensing Nitrite through a Pseudoazurin–Nitrite Reductase Electron Transfer Relay

ChemPhysChem, 2005
AbstractNitrite is converted to nitric oxide by haem or copper‐containing enzymes in denitrifying bacteria during the process of denitrification. In designing an efficient biosensor, this enzymic turnover must be quantitatively assessed. The enzyme nitrite reductase from Alcaligenes faecalis contains a redox‐active blue copper centre and a nonblue ...
Astier, Y., Canters, G.W., Davis, J.J., Hill, H.A.O., Verbeet, M.P., Wijma, H.J.   +5 more
openaire   +4 more sources

Relationship Between Periodontitis and Nitric Oxide in Patients Undergoing Maintenance Hemodialysis

Hemodialysis International, EarlyView.
ABSTRACT Background The inflammatory processes associated with periodontitis have been implicated in the development and progression of systemic diseases, including chronic kidney disease (CKD). Notably, individuals with CKD frequently exhibit shared risk factors with those affected by periodontitis, such as hypertension, smoking, and diabetes mellitus.
Gabriela Keiko Izumi, Caroline Vidal Paseto, Rafael Fiorese Costa, Gabrielle Delfrate, Aline Borsato Hauser, Daniel Fernandes, Maria Ângela Naval Machado, Reila Tainá Mendes   +7 more
wiley   +1 more source

A Nexafs Study of Nitric Oxide Layers Adsorbed from a nitrite Solution onto a Pt(111) Surface [PDF]

arXiv, 2008
NO molecules adsorbed on a Pt(111) surface from dipping in an acidic nitrite solution are studied by near edge X-ray absorption fine structure spectroscopy (NEXAFS), X-ray photoelectron spectroscopy (XPS), low energy electron diffraction (LEED) and scanning tunnelling microscopy (STM) techniques.
arxiv  

Sulfide- and nitrite-dependent nitric oxide production in the intestinal tract [PDF]

, 2011
In the gut ecosystem, nitric oxide (NO) has been described to have damaging effects on the energy metabolism of colonocytes. Described mechanisms of NO production are microbial reduction of nitrate via nitrite to NO and conversion of l-arginine by NO ...
Boeckx, Pascal, Boon, Nico, Van de Wiele, Tom, Van Nieuwenhuyse, Glynn, Vermeiren, Joan, Verstraete, Willy   +5 more
core   +1 more source

Host‐induced gene silencing of the amino acid biosynthesis gene acetolactate synthase of Phytophthora infestans caused strong enhanced late blight resistance of potato in the field

Plant Biotechnology Journal, EarlyView.
Summary Late blight caused by Phytophthora infestans is the most serious disease of potatoes. Here we present the effectiveness of the host‐induced gene silencing (HIGS) technology against an amino acid biosynthesis gene of the pathogen to increase the resistance against the plant‐infecting oomycete in the field.
Nora Temme, Tobias Haehre, Clarissa Boyher, Lydia Hoppe, Colin Davenport, Zach Stumo, Kai Prenzler, Anja Maeser, Maike Pflugmacher, Kerstin Koch, Dietmar J. Stahl   +10 more
wiley   +1 more source